Sinclair ZX80 / ZX81 / Z88 Forums

Hi, http://zx81.ordi5.free.fr/brico/Elettronica2000/kicad/64k_1.jpg http://zx81.ordi5.free.fr/brico/Elettronica2000/kicad/64k_2.jpg I plan to rebuild this card, but some of pins on the PCB are unknown. http://zx81.ordi5.free.fr/brico/Elettronica2000/kicad/64k_PCBS.jpg schema.jpg My Kicad project (no...

Can try too…
Send me a PM this a link to a web files host.

Cool !

Yes, a shame…
But, the REM may be useful for …

My old TV sound better on a random unused chanel… like a pink noisy sound in a snowing day.

Hi, A little demo from this web page: http://www.muzines.co.uk/articles/micromusic/4456 1 REM YY@D3@DFYY@D3@0F@C9 2 GOTO 7 3 POKE A,D 4 POKE B,C 5 LET X=USR E 6 RETURN 7 LET A=16515 8 LET B=16519 9 LET E=16514 10 IF INKEY$="" THEN GOTO 10 20 LET K$=INKEY$ 25 IF K$="0" THEN LET K$="10" 30 GOTO VAL K$...

Hi,

Project: STL like RAM pack box.


STL files, Wings files and Kicad template.
http://zx81.ordi5.free.fr/brico/stl_box/

Nb: If you try to print it (about 9h45), let me know about errors and reals pictures.


Have fun...

Great job !
But, something's wrong in VB81.
The screen saver seem ok, but the game display hank on "K" characters. Is it a special config ?

So replace all 4 caps but make on 1uf?

No, in this case, try to change each capacitor.
If it steel wrong, check the capacitor in the Zx81's case to drive the 7805 regulator.

Yes, you can try the piggyback.


But, it seem to be an address decoding problem from the ULA...